Opti

**juice nukem** · 04-30-2011, 08:48 AM

Hi Guys,
My car died a couple of days ago while I was driving it. Got it home, I checked fuel pressure and pressure was good. No spark. Changed out ignition module and coil, still no spark. I have a new AC Delco OPTI. What is involved in changing it? It is a 1993 LT1.
Thanks,
Todd

**94maroz28** · 04-30-2011, 11:24 AM

I have to put another optispark on my car. Not to bad to replace. Pull the crankpully and the waterpump and you can get right to it. You will need a small E4 Reverse Torks socket(i think thats the size. i have one at work and cant look at it now) to remove the cap. Other than that not to bad to replace.
.

**5.0THIS** · 04-30-2011, 03:02 PM

There are online tutorials with pictures that should help you out.

**TLS_Addict** · 05-01-2011, 04:33 PM

Belts, pully, water pump, wires.....oh and the induction tube for the air box.

**juice nukem** · 05-01-2011, 06:36 PM

well got it all tore down, all cleaned up and the opti is different were there a change in this opti?

**TLS_Addict** · 05-01-2011, 06:40 PM

Is it vented?

They swapped over to them after a few years.

What is differnet?

**02transamce** · 05-01-2011, 06:42 PM

If i'm not mistaken the 95-97 lt1s had a redesigned opti.
Posted via Mobile Device

**juice nukem** · 05-01-2011, 06:45 PM

yes its vented, 93 lt1 so looks like a 95 opti. but there was no vent hose on it when i tore it down, i bought the car from a lady at work and she said she had lots of problems with this.

**TLS_Addict** · 05-01-2011, 06:47 PM

They did have a revision but I thought they would still work from year to year. Cant be 100% sure on that. I know my dads 93 has an MSD Opti.

**juice nukem** · 05-01-2011, 06:58 PM

the opti came off the car it has a shaft that has splinds on it and the new one didnt and the new cap doesnt have a vent but the old one did but didnt have nothing hooked up to it

**TLS_Addict** · 05-01-2011, 07:10 PM

Huh, sounds like someone retro-fitted a later version and now you have a stocker to put on it.

**krese** · 05-02-2011, 05:19 AM

Originally Posted by TLS_Addict

Huh, sounds like someone retro-fitted a later version and now you have a stocker to put on it.

^^ THIS!

a vented opti isn't going to do you a damn bit of good with out the vacuum lines and 93-94 didn't have em. in fact it would be worse to put on the vented opti with nothing hooked up because you have open spots where water/moisture can get in. i would put in the correct part for 93 and be done with it.

**TLS_Addict** · 05-02-2011, 07:06 AM

Originally Posted by krese

^^ THIS!

a vented opti isn't going to do you a damn bit of good with out the vacuum lines and 93-94 didn't have em. in fact it would be worse to put on the vented opti with nothing hooked up because you have open spots where water/moisture can get in. i would put in the correct part for 93 and be done with it.

HE IS BACK FROM THE DEAD! lol

I would go with the stocker and just be done with it. Lots of guys run 10s on a stock opti.

**juice nukem** · 05-06-2011, 07:21 PM

Good evening guys,
Finally got the right opti AC Delco. Straight forward and easy to do. Changed all the ignition parts, still have no spark. Two days before it stopped running, I had a alarm and command start put in. If the ECM bad, would the car have no spark? My brother is going to scan it tomorrow, he thinks it is the command start.
Thanks,
Todd

**juice nukem** · 05-07-2011, 09:35 AM

Computer checks out, it is not the alarm or the command start. Now I guess I will test the OPTIC Harness. Has anyone had an issue with these harnesses?

**TLS_Addict** · 05-07-2011, 09:43 AM

I havent. Any codes at all?

You said you are getting fuel but no spark right?

**juice nukem** · 05-07-2011, 09:46 AM

Yes getting fuel no spark, changed OPTI and coil and ignition module. Got to go back to work to get a test light. Will check harness. It is Driving me CRAZY.

**02transamce** · 05-07-2011, 11:02 AM

Opti problems are a bitch. Good luck,man.
Posted via Mobile Device

**juice nukem** · 05-10-2011, 05:24 PM

Hey guys,
waiting for my brother to get back from holidays. My scanner won't do OB1, my brothers does both. If the ignition coil/module is bad will it throw a code?

Thanks,
Todd

**TLS_Addict** · 05-12-2011, 06:30 AM

I cant be certain as I havent dealt much with OB1. My experience with a bad coil in my fathers 1993 Corvette threw ZERO codes. However, it did have some spark but at upper RPMs it would go to shit.

Does the car do anything when you turn the key?